Journal
NANOSCALE
Volume 10, Issue 37, Pages 17546-17551Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr06459h
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Funding
- National Natural Science Foundation of China [51464028]
- Candidate Talents Training Fund of Yunnan Province [2017PY269SQ]
- Independent Research Funds for the State Key Laboratory [CNMRCUTS1601]
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Hydrogen produced by electrochemical water splitting offers a hopeful and renewable solution for addressing the global energy crisis; however, development of highly efficient non-noble-metal electrocatalysts remains a big challenge. Herein, we report a facile strategy to fabricate oxygen deficiencies-rich nickel/nickel (oxy) hydroxide hybrid films as efficient electrocatalysts for water splitting by in situ oxygen evolution reaction (OER) activation. Under OER conditions, the originally deposited Ni films from the ethaline-based deep eutectic solvent (DES) undergo a structural rearrangement with a phase transformation in the oxidation state from Ni(II) to Ni(III) at the surface. The change is coupled with an increase in oxygen deficiencies and a pronounced defective precursor is induced by the addition of nitrate ions, providing structural disordering and boosting the intrinsic activity of the catalyst, which strongly enhances the water splitting performance.
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